VGA port signal examining apparatus and method thereof

Abstract

This present invention is a VGA port signal examining apparatus and method thereof. By intercepting the analog signals transmitted from the VGA port to the monitor, such as vertical signals, horizontal signals, R-signals, G-signals, and B-signals, and by examining the relative data of analog signals to determine whether the VGA port is normal or not.

1 . A VGA port signal examining apparatus, comprising:
 a signal intercepting module, connected to a VGA port to intercept plural analog signals transmitted from the VGA port to a monitor, wherein the analog signals comprises a vertical signal, a horizontal signal, an R-signal, a G-signal, and a B-signal; and   a signal judging circuit, linking to the signal intercepting module, and comparing the magnitude of the analog signals with specific examination data set by a user to determine whether analog signals transmitted via the VGA port being normal or not, wherein comparing the magnitude of the analog signals with specific examination data comprises judging means as follows:
 (a) judging if the vertical signal is output on a specific frequency; 
 (b) judging if the magnitude of the horizontal signal exceeds a first level-potential; and 
 (c) judging if the magnitude of the R-signal, the magnitude of the G-signal, or the magnitude of the B-signal exceeds a second level-potential. 
   
   
   
       2 . The VGA port signal examining apparatus of  claim 1 , wherein the specific frequency comprises one selected from 60 Hz, 70 Hz, and 85 Hz. 
   
   
       3 . The VGA port signal examining apparatus of  claim 1 , wherein the first level-potential is 1 volt. 
   
   
       4 . The VGA port signal examining apparatus of  claim 1 , wherein the second level-potential is 0.05 volt. 
   
   
       5 . A VGA port signal examining method, comprising steps as follows:
 intercepting plural analog signals transmitted via a VGA port by a signal intercepting module;   judging if a vertical signal is output on a specific frequency via the VGA port by a signal judging circuit;   judging if a magnitude of a horizontal signal exceeds a first level-potential by the signal judging circuit;   judging if a magnitude of an R-signal exceeds a second level-potential by the signal judging circuit;   judging if a magnitude of a G-signal exceeds the second level-potential by the signal judging circuit; and   judging if a magnitude of a B-signal exceeds the second level-potential by the signal judging circuit.   
   
   
       6 . The VGA port signal examining method of  claim 5 , wherein the signal intercepting module connects to the VGA port to intercept plural analog signals which comprise the vertical signal, the horizontal signal, the R-signal, the G-signal and the B-signal, transmitted from the VGA port to a monitor. 
   
   
       7 . The VGA port signal examining method of  claim 5 , wherein the signal judging circuit compares the magnitude of the analog signals with specific examination data set by a user. 
   
   
       8 . The VGA port signal examining method of  claim 5 , wherein the specific examination data comprises the specific frequency, the first level-potential, and the second level-potential. 
   
   
       9 . The VGA port signal examining method of  claim 5 , wherein the specific frequency comprises one selected from 60 Hz, 70 Hz, and 85 Hz. 
   
   
       10 . The VGA port signal examining method of  claim 5 , wherein the first level-potential is 1 volt. 
   
   
       11 . The VGA port signal examining method of  claim 5 , wherein the second level-potential is 0.05 volt.